tidy root command

cmd/carapace/cmd/action/completer.go

@@ -0,0 +1,38 @@
+package action
+
+import (
+	"encoding/json"
+
+	"github.com/rsteube/carapace"
+	"github.com/rsteube/carapace/pkg/style"
+)
+
+func ActionCompleters() carapace.Action {
+	return carapace.ActionCallback(func(c carapace.Context) carapace.Action {
+		return carapace.ActionExecCommand("carapace", "--list=json")(func(output []byte) carapace.Action {
+			var completers []struct {
+				Name        string
+				Description string
+				Spec        string
+				Overlay     string
+			}
+			if err := json.Unmarshal(output, &completers); err != nil {
+				return carapace.ActionMessage(err.Error())
+			}
+
+			vals := make([]string, 0, len(completers))
+			for _, completer := range completers {
+				s := style.Default
+				if completer.Spec != "" {
+					s = style.Blue
+				}
+				if completer.Overlay != "" {
+					s = style.Of(s, style.Underlined)
+				}
+
+				vals = append(vals, completer.Name, completer.Description, s)
+			}
+			return carapace.ActionStyledValuesDescribed(vals...)
+		})
+	})
+}